Hi thanks for your question.
You have have been treated for bladder cancer
.The symptoms you are having all could be part of your bladder cancer treatment .
Most probably you have recived chemo and radiotherapy after surgery for treatment of bladder cance.Radiotherpy causes what is called as radition cystitis
,which gives bladder pain and other symptoms.Acidity could be due to analgesic
(pain killer) which you have taken for pain.I would suggest you to consult your treating surgeon ,who may examine to rule out complications of chem radiotherapy and may prescribe you appropriate treatment
Hope this answers your question.